Set HWM option to zero to override new default in zeromq 3.x

perf/remote_thr.lua

@@ -31,6 +31,8 @@ local zmq = require"zmq"
 
 local ctx = zmq.init(1)
 local s = ctx:socket(zmq.PUB)
+-- for ZeroMQ 3.x need to change HWM option.
+s:set_hwm(0)
 s:connect(connect_to)
 
 zmq.sleep(1)

perf/thread_thr.lua

@@ -38,6 +38,8 @@ local child_code = [[
 
 	local ctx = zthreads.get_parent_ctx()
 	local s = ctx:socket(zmq.PUB)
+	-- for ZeroMQ 3.x need to change HWM option.
+	s:set_hwm(0)
 	s:connect(connect_to)
 
 	local data = ("0"):rep(message_size)